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Appendix C: Glossary
WPA (Wi-Fi Protected Access): WPA is a security technology for wireless networks that improves
on the authentication and encryption features of WEP (Wired Equivalent Privacy). In fact, WPA
was developed by the networking industry in response to the shortcomings of WEP. One of the
key technologies behind WPA is the Temporal Key Integrity Protocol (TKIP). TKIP addresses the
encryption weaknesses of WEP. Another key component of WPA is built-in authentication that
WEP does not offer. With this feature, WPA provides roughly comparable security to VPN
tunneling with WEP, with the benefit of easier administration and use. This is similar to 802.1x
support and requires a RADIUS server in order to implement. The Wi-Fi Alliance will call this,
WPA-Enterprise. One variation of WPA is called WPA Pre Shared Key or WPA-PSK for short, this
provides an authentication alternative to an expensive RADIUS server. WPA-PSK is a simplified
but still powerful form of WPA most suitable for home Wi-Fi networking. To use WPA-PSK, a
person sets a static key or "passphrase" as with WEP. But, using TKIP, WPA-PSK automatically
changes the keys at a preset time interval, making it much more difficult for hackers to find and
exploit them. The Wi-Fi Alliance will call this WPA-Personal.
